Double telescope



K. AHMELS.

DOUBLE TELESCOPE. APPLICATION FILED MAI 10,1920.

1 ,41 2,442. Patented Apr. 11, 1922.

UNITED STATES PATENT OFFICE.

KARI. AHME'Ls; or cAssEL, GERMANY..

DOUBLE TELESCOPE.

' Application filed May 10,

To all whom it may concern:

Be it known that I, KARL AHMELS, a citizen of the German Republic, residing at- Cassel, German Republic, have invented certain new and useful Improvements in Double Telescopes, of which the following is a specification.

With the double telescopes of knownconstruction the adjustment of the lens as regards eye-distance and distinotness of the image is effected through the bending of joints, by means of toothed wheels and pinions or, otherwise expressed, through elements which are difiicult to make and expensive. This invention relates to an adjusting device which consists only of parts which move in slits and of cylindrical parts which turn the one in the other. .In this manner the advantage is obtained that the connection between the two telescopes. is rectilinear and shiftable only in itself, the optical axial distance of the tubes being regulated through turning a member of the corresponding tube or telescope, the axis of the lens tube being eccentrically arranged in said member.

In the accompanying drawing the invention is shown by way of example:

Fig. 1 is a perspective view of the double telescope.

Fig. 2, shows in a similar view as Fig. 1, the different parts of the telescope separated from each other.

The casings 1. and 2 are rigidly connected by a transverse piece 3. The casings 1 and 2 form, so to say, eccentric rings for the reason that the lens tubes 4 are in fact eccentric owing to a thickening 8 arranged at one side of the lens tube. Thus, the socket 5 for the ocular lens 6 and the socket 7 for the objective are eccentric the one with regard to the other and move towards or away from one another if one of the sockets 5 or both sockets 5 are rotated. The lens sockets 5 are connected with one another by a bridge 9. The sockets 5 are milled. If one of the sockets 5 is rotated, the corresponding ring 4 is displaced in its casing 1 or 2 through the joining piece 8 so that the optical axis 10 moves towards or away from the optical axis 11 and vice versa.

The transverse piece 3 which rigidly connects the tubular casings 1 and 2 is composed of the fixed part 12 and of the remov- S'p'ecification of Letters Patent.

Patented Apr. 11, 1922.

1920. Serial No. 380,397.

able part 13. This removable part. 13 isfixed upon the part 12 by means of screws 14. The fixed part 12 has at its middle a vertical guide slot 16 designed to receive a slide 15. The removable part 13 has in its inner wall arectangular horizontal cavity 17 and further a horizontal slot 18 for the passage of the thickened art 19 of a screw 21 mounted in a horizonta plate 20. The inner end 22 of screw 21 engages with a slanting slot 23 of the vertical slide 15. The horizontal plate 20 serves on the one hand to guide the screw 21 and on the other hand to cover the slot 18. The screw 21 has a milled head 24.

If the screw 21 is moved to the right or left, it moves the plate 20 in the corresponding direction, the vertical slide 15 being lifted or lowered according to the direction in which the head 24: of the screw 21 is being moved.

The usefulness of the telescope is still further increased by a mirror 31 through which persons or objects at the back of the person who uses the telescope can be observed. Instead of a plane mirror, as shown, a convex mirror or the like can be used in order to enlarge the range of observation.

A hand 33 of the head 24 of the screw 21 moves over a scale 32 designed to indicate a special adjustment.

1. Improved means for adjusting telescopes comprising in combination the tubular casings rigidly connected the one with the other, a lens tube in each tubular casing, a thickening at one side of said lens tube rendering the opening through said tube ec centric, an adjustable bridge connecting the lens tubes, and means for uniformly moving the said lens tubes towards or away from one another.

2. Improved means for adjusting telescopes comprising in combination the tubular said vertical groove of the transverse piece stantiallv as described and shown and for and having a slanting slot near its foot end, the purpose set forth. a 10 a regulating screw with milled head in said In testimony whereof I affix my signature longitudinal slot of the, removable plate in presence of two witnesses.

engaging with its inner end with said slant- KARL AHMELS. ing slot of the Vertical slide, and a plate upon WVitnesses: the stem of said screw located in said rec- 'EMIL WEINERT,

tangular cavity of the removable plate, sub- HEINRICH Mt'jLLnn. 

